A mycobacteriophage is a member of a group of bacteriophages known to have mycobacteria as host bacterial species. While originally isolated from the bacterial species Mycobacterium smegmatis and Mycobacterium tuberculosis,[2] the causative agent of tuberculosis, more than 4,200 mycobacteriophage species have since been isolated from various environmental and clinical sources. 2,042 have been completely sequenced.[3] Mycobacteriophages have served as examples of viral lysogeny and of the divergent morphology and genetic arrangement characteristic of many phage types.[4]
All mycobacteriophages found thus far have had double-stranded DNA genomes and have been classified by their structure and appearance into siphoviridae or myoviridae.[5]